They’re not rules, OK? You don’t have to do them, any more than you have to use a hammer or a screwdriver. It’s really good, before repairing something, to know how to use a hammer and a screwdriver well, and it’s really good not to try to fix everything with just one of those tools — or even both.

They’re not rules. They are, however, darn good things to know how to do, and do well.